Gerber Avalanche

Has anyone tried the Gerber Avalanche model 21-818? I am getting ready to place a stock order and was thinking of trying a few of these. They are a gravity toilet with a 3" flush valve. They are suppose to do approx. 1000g bulk waste. Also, we have carried the Gerber "Aqua Saver" toilet for quite some time now. But they have come out with the "Viper" line that will be replacing the "aqua Saver" in time. Has anyone had any experience with these?